F. Pacard, SOLUTIONS WITH HIGH-DIMENSIONAL SINGULAR SET, TO A CONFORMALLY INVARIANT ELLIPTIC EQUATION IN R(4) AND IN R(6), Communications in Mathematical Physics, 159(2), 1994, pp. 423-432
We construct positive weak solutions to the equation -DELTA0upsilon =
upsilon(n+2/n-2), where -DELTA0 denotes the conformal Laplacian on the
n-sphere (n = 4,6), having singular sets of Hausdorff dimension great
er than or equal to n-2/2.